I have this DC motor (the 38.2V version). I want to maximize the power put into it for 10-20 seconds, but I can only use 4 lithium 9V batteries. I know that as the batteries discharge, the voltage decreases.

From my research, I found some possibilities:

- Charge capacitors, which discharge into the motor.
- Use a Buck Converter, which would give me more current, but less voltage.
- Use a Boost Converter, which would give me the inverse of #2.
- Something else?

How would I do this?